Its frequency (wavelength).
While the ball would still be green it will appear black. Anything green absorbed all colours except green. The green light is reflected to your eyes which makes it look green. Thus in red light (with no green in it) the red will be absorbed and no green light can be reflected to your eyes so the ball will look black.
A green light makes a red object appear black, because red objects absorb green light and do not reflect any visible light back.
if a red cricket ball was viewd in red light it would appear to be the colour of black or blue that's what colour you would be if it hit youin the face lol.
Green light - Green, White light - Green, Red light - Black
Red light creates monochromatic color : all objects will appear in shades of red from brightest (white becomes bright red) to darkest (very dark colors appear dark red or black). So something green would not necessarily appear black, but a shade of red corresponding in hue to its grayscale equivalent.
The reason the shirt appears red in white light is because it is absorbing all other colours apart from red which it is reflecting into your eyes. When in a green light there is no red component of the light to be reflected so the shirt absorbs all the available light which makes it appear black.
To make green appear black, shine red light on it. Green absorbs red light, so when red light is shone on green, the green will appear black.
In green light, a red book would appear black. Green light does not contain any red wavelengths to reflect off the red book, so it would absorb most of the green light and appear black instead.
A red flower viewed by green light will appear to be black.
Things appear red because they absorb all wavelengths of visible light apart from red this will be reflected. If you only shine green light on the object it will all be absorbed and no light will be reflected so it will appear black.
In red light, a green apple would appear dark or black because red light contains wavelengths that are opposite to green on the color spectrum. This causes green objects to absorb the red light and reflect very little, resulting in a dark appearance.
The green object will appear black because red light is absorbed by green objects.